combination of read/write and earlyclobber constraint modifier

[Marcus Shawcroft]

On 2 July 2014 09:02, Tom de Vries <Tom_deVries@mentor.com> wrote:
> On 02-07-14 08:23, Marc Glisse wrote:
>>
>> In the first example you gave, looking at the pattern (no match_dup,
>> setting the
>> full register), it seems that it may have wanted "=&" instead of "+&".
>
>
> [ move discussion from gcc ml to gcc-patches ml ]
>
> Marcus,
>
> The +& constraint on operand 0 of vec_unpack_trunc_<mode> seems wrong, since
> the template does not use the operand as input.
>
> This patch fixes that.
>
> OK for trunk if aarch64 build & regtest succeeds ?

Your patch looks fine, operand 0 isn't used for input.  OK assuming no
regression.   Did you find this by inspection or is this the cause of
some bug?

/Marcus